Adhesive Sealant Council in America has a basic definition for an adhesive: A material used for bonding that exhibits flow at the time of application. Having the right adhesive for the right project is very important because if you don't match the glue to the material you are working on, there is a possibility that you don’t get the good result or it might end up looking unprofessional. Get the right glue and you will finish your projects perfectly well. Another important point in adhesion technology , is preparation of the surfaces of the materials before bonding together. To do this, the surface of the surface must be smooth enough , clean , and chemically receptive to the adhesive that you have chosen. Different types of adhesives are used for different materials. For example, if a product that you are using adhesive for is going to be used outside you should use a waterproof adhesive. The main types of adhesive are PVA (polyvinyl acetate), synthetic resin, epoxy resin, contact adhesive and acrylic cement.
PVA (polyvinyl acetate) : General purpose woodwork glue. Some PVA adhesives are water resistant.
Synthetic resin : A strong water-resistant glue for woodwork. It needs to be mixed up immediately before use.
Epoxy resin : For joining metals and plastics. It is waterproof but must be mixed up immediately before use.
Contact adhesive : For joining polystyrene and fabrics. Also useful for fixing plastic laminates to a wooden base.
Acrylic cement : For the joining of acrylic and some other types of plastics. The adhesive "melts" the surface of the plastic and fuses it together.